Cub reporter Billy Batson (Frank Coghlan Jr.) accompanies a scientific expedition to Siam. There he is visited by the wizard Shazam (Nigel De Brulier) who grants him the ability to turn into the superhero Captain Marvel (Tom Tyler) so that Billy can protect the Golden Scorpion idol found on the expedition. The scientists realize the idol can be the most powerful weapon in the world and remove the lenses that power it, with the lenses distributed among the team to prevent any one member from using the idol. When the team gets back to the States, a mysterious masked criminal who calls himself the Scorpion tries to get his hands on the five lenses. Who is the Scorpion, and can Billy Batson/Captain Marvel stop him?
